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A 14-Pole Dual-Band High Temperature Superconducting Filter Including Narrow Bandstop Notches

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Abstract

This paper presents a 14-pole dual-band high selective high temperature superconducting (HTS) filter including two narrow notches. A flexible half-wavelength resonator, two cross-coupling structures and a novel feeding structure are proposed and analyzed successively. The HTS filter is fabricated on a 2-inch-diameter double-side DyBa2Cu3O7 HTS thin film with a 0.5-mm-thick MgO substrate and measured with a low-temperature test system at 65 K. The measured results show that the filter has 1 dB passbands of 1363–1440 MHz and 1490–1566 MHz, respectively. The filter has two narrow notches with maximum notch depths of more than 30 dB. Due to the cross-coupling structures, five transmission zeroes are located at both sides of the two passbands, which further improve the selectivity of the filter. The measured results are in good agreement with the simulated ones.

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Acknowledgements

This work was supported by the Shenzhen Clean Energy Research Institute.

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Authors and Affiliations

  1. College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China

    Xiao Yu & Peiguang Yan

  2. Advanced Energy Research Center, Shenzhen University, Shenzhen, 518060, China

    Xiao Yu

  3. Institute of Plasma Physics, Chinese Academy of Science, Hefei, 230031, Anhui, China

    Weibin Xi

Authors
  1. Xiao Yu
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  2. Weibin Xi
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  3. Peiguang Yan
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Correspondence to Weibin Xi.

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Yu, X., Xi, W. & Yan, P. A 14-Pole Dual-Band High Temperature Superconducting Filter Including Narrow Bandstop Notches. J Low Temp Phys 204, 163–173 (2021). https://doi.org/10.1007/s10909-021-02605-8

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  • DOI: https://doi.org/10.1007/s10909-021-02605-8

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